‘Aromatic ring umpolung’, a rapid access to the main core of several natural products
作者:Kimiaka C. Guérard、Cyrille Sabot、Marc-André Beaulieu、Marc-André Giroux、Sylvain Canesi
DOI:10.1016/j.tet.2010.03.096
日期:2010.7
substituted phenols in the presence of (diacetoxyiodo)benzene promotes the formation of a phenoxenium ion, a very electrophilic species able to react with various nucleophiles leading rapidly to a plethora of different cores present in natural products via several novel oxidative processes. This strategy fits within the concept of ‘aromatic ring umpolung’; in this paper a personal account by our laboratory
Treatment of various substituted phenols in the presence of iodobenzene diacetate, perfluorinated alcohols and furan, allylsilanes or cyclic enol ethers promotes an oxidative annulation process in moderate to useful yields. In only one step, this method produces different heterocyclic rings such as dihydrofuranobenzofurans, tetrahydrofuranobenzofurans, tetrahydropyranofurans, and dihydrobenzofurans
Nitrogenous Educts through Oxidative Amidation of Phenols: The Bimolecular Reaction
作者:Sylvain Canesi、Denis Bouchu、Marco A. Ciufolini
DOI:10.1021/ol048094v
日期:2005.1.1
[Reaction: see text] The elusive oxidative amidation of phenols to 4-aza-substituted dienones in the bimolecular mode may be achieved by treatment with iodobenzene diacetate ("DIB") in a mixture of hexafluoro-2-propanol and acetonitrile.
Catalytic Aerobic Cross-Dehydrogenative Coupling of Phenols and Catechols
作者:Wenbo Xu、Zheng Huang、Xiang Ji、Jean-Philip Lumb
DOI:10.1021/acscatal.8b04443
日期:2019.5.3
describe a selective, catalytic aerobiccross-dehydrogenativecoupling (CDC) reaction of phenols and catechols that creates aryl ethers. To avoid challenges of selectivity, we employ copper (Cu) coordination to confine substrate redox to the inner coordination sphere of the metal. This minimizes nonselective radical processes to provide high levels of selectivity for cross over homo coupling, by C–O instead
Synthetic aspects of the oxidative amidation of phenols
作者:Huan Liang、Marco A. Ciufolini
DOI:10.1016/j.tet.2010.05.020
日期:2010.7
action of hypervalent iodine reagents. The reagent, (diacetoxyiodo)benzene (‘DIB’) is especially effective in these transformations. This paper focuses on techniques for the desymmetrization of the dienoes thus obtained, leading to the stereocontrolled creation of N-substituted spiro carbons. The methodology creates new opportunities in alkaloid synthesis, as apparent from a number of examples.